Inserting head for stator coil inserting machines



5 Sheets-Sheet 1 Y J. POLARD INSERTING HEAD FOR STATOR COIL INSERTINGMACHINES Fgja. Fsgll.

April 8, 195s Filed July 10, 1953 INSERT-ING HEAD FOR STATOR COILINSERTING MACHINES Filed July l0. 1953 J- POLARD April 8, 1958 5Sheets-Sheet 2 3 4 l 3. el o wNnAwM/Y a wl xm .dx e ,r /f 7A f ||\|Il1.I I lll w m .WM l ,m www I 1 lmwlilwi i M mM Q 3 f i 7 99 En? n v VM.fav

INSERTING HEAD FOR STATOR COIL INSERTING MACHINES Filed July 1o, 1955 J.POLARD April 8, 1958 5 sheets-sheet 3 Fig CONTROL DISTRIBUTOR J. POLARDApril 8, 1958 INSERTING HEAD FOR STATOR COIL INSERTING MACHINES FiledJuly 1o, 195s 5 Sheets-Sheet 4 April 8, 1958 J. POLARD 2,829,428

INSERTING HEAD FOR STATOR COIL INSERTING MACHINES Filed July 10. 1953 5Sheets-Sheet 5 Fig] INSERTING HEAD FOR STATOR COIL INSERTING MACHINESJean Polard, Saint-Germain-en-Laye, France, assignor to Societe Anonymedite: Compagnie Electro-Mecanique, Paris, France Application July 10,1953, Serial No. 367,276

Claims priority, application France November 7, 1952 4 Claims. (Cl.29-205) The automatic winding of stator coils of electrical machines,particularly of induction motors, for example of the character describedin the U. S. Patent No. 2,506,173, filed on November 4, 1948, may beeffected by means of mechanicallyor hydraulically-controlled machines.In order to keep the operationof the coil inserting machine abreast withproduction rate requirements, the various steps involved must be fullyor partially automatic. Thus, these more or less fully automaticproduction conditions have led to the development of progressively morecompact units comprising the transfer members and coil formers (such astelescopic cones and combs), called winding heads which, in comparisonwith the arrangement disclosed in the aforementioned patent offerseveral new features in the art.

It is the essential object of this invention to providean inserting headofl the type broadly described hereabove, the essential feature of thisnovel inserting head consisting in that by using this inserting head ona single coil inserting machine it is possible to insert coils instators of different diameters and lengths, Within large limits.

An inserting head according to this invention comprises the followingcomponents:

A body consisting of one or more parts for supporting and assembling theVarious members of the head. With this body the inserting head maybecome either a fully self contained unit or on the contrary a more orless integral part of the very frame structure of the coil insertingmachine;

A central shaft for longitudinally positioning the false or dummyrotors;

Telescopic tubular members formed with frusto-conical end portions, withtheir corresponding locking means and lcommon return stud, mounted onthe aforesaid central shaft through the medium of a suitably shapedmember;

A camshaft the new design of which constitutes one of the essentialfeatures of the invention;

A mechanical, rigid connection between the central shaft and thecamshaft, which also constitutes one of the essential features of thisinvention;

Control members or control-operated intermediate members, according asla mechanical or hydraulic control is contemplated.

In the above-mentioned patent Ithe position of the stepped camsA of thecamshaft was stationary in the spa-ce. The action exerted by thetelescopic tubular members on the dummy rotor driver-rods depended onthe displacement, ,along the stepped cams, of the tubular member lockingdevice, so .that any alteration in the relative positionof the dummyrotor with respect to the cams resulted in a changein the kind of actionexerted by the tubular members and therefore in the centripetalkdisplacement of the driver-rods. Now any variation in the length of thedummy rotor would involve automatically this change in the ,relativeposition.

This inconvenience is avoided by forming on one face of the camshaft aseries of steps to be substituted for the atent 2,829,428 Patented Apr.8, 1958 "lee shaft to the central shaft. Thus, any longitudinaldisplacement `of the .central shaft will produce an equivalentdisplacement of the camshaft.

rI`he invention will now be described with reference to the attacheddrawings, wherein:

Figures l and la are diagrammatic, part-sectional, partelevational viewsshowing an inserting head of a stator coil inserting machine, Fig. lahaving a section portion taken on the line la--la of Fig. l.

Figure 2 is a sectional view showing a hydraulicallyactuatedcoil-inserting head, the section being taken on the line lI--II of Fig.4.`

Figure 3 is a ysection taken on the line IIl--III of Fig. 2.

Figure 4 is another section taken on the line IV-IV of Figure 5 is afurther section taken on the line V-V of Figs. 2 and 3.

Figure 6 shows a dummy rotor and the push members as positioned beforethe coils are inserted into the slots.

Figures 7 to 9 are fragmentary views showing in section the end portionof the dummy rotor and the end portion of a coil-inserting head atthebeginning, in the middle, and up completion of a coil-insertingoperation.

lThe central shaft 1 is connected through a mechanical linking member 3to the camshaft 2. Thus, the bearing face 4 of thefcent'ral shaft whichengages the dummy rotor spindle S has constantly the same relativeposition with respect tothe steps 5, 6, 7 formed on one face of thecamshaft. For inserting coils in stators of same diameter but dierentlengths, the dummy rotors are provided with a constant-length spindle 8,as already set forth hereinabove, and as aresult the release of thelocking device 9, as it engages the different steps of the camshaft,will take place for constantly unvarying movements or strokes of thetubular members 16, l1 and l2, which correspond to constantly identicalradial movements of the driver-rods. During this operation the bearingface 4 of the central shaft 1 may be in any spatial vposition dependingonly on the total length of the dummy rotor and therefore on the length-of the notched portion thereof, and finally on the core length of thestator to be wound, as the spindles have a constant length. l Y

Regarding the possibility of inserting coils in statorshaving bores ofdifferent diameters, this will depend only on the total thickness, atthe end of their travels, of the on the camshaft corresponds to -thenumber of tubular v members used, in carrying out the invention thewhole or part of the number of steps available will be used according tothe bore diameter of the stator to be wound, the

proper method depending on the adequate selection of the lengths ofthecorresponding dummy rotor spindles.

From the foregoing it will be seen that with an inserting head made inaccordance with the principles of this invention it is possible:

(a) To directly insert coils in stators lof same diameterA and differentlengths, provided the corresponding dummy rotors are tted with spindlesof unvarying length;

(b) To insert coils in stators of same length anddif-Y ferent diameters,provided that thenumber and/or e thickness of the telescopic tubularmembers are'modied accordingly, and that adequate lengths are selected`for the dummy rotor spindles. Y

aangaan Besides, the yfact that all the inserting and forming membersare combined into a unitary inserting head makes it possible to quicklymatch the desired number of tubular members with the adequate thickness.

Reference will now be made tothe Figs. 2 'to 5. of the accompanyingdrawings which show a hydraulically controlled inserting head.

In this form of embodiment the body of the inserting head consists ofthree elements 13, 19 and 2E) assembled through an intermediate member21 and closed by a cap member 18. The central shaft 22 isan axialextension of a central piston 14 controlling the longitudinal travel ofthis shaft. The camshaft 23 has fitted therein a toothed segment 17 andis rigidly connected to the central shaft 22 through a link member 24located in a cavity of the piston 14 and fastened to the camshaft 23.The toothed segment 17 enables kthe camshaft 23 to rotate about its axisunder the impulse of the toothed rack'38 actuated in turn by a piston39. The dilferent steps formed on one face of the camshaft are shown at33, 34, 35, 36 and Fig. 5 shows the face 40 of this shaft whereby thetubular members can be released after rotating this shaft through onefraction of a revolution, for instance a quarter turn.

The casting13 forming one element of the body comprises a pair of boresreceiving corresponding pistons and 16 for actuating the guide member 30supporting the telescopic tubular members 25, 26, 27, 28 (see Fig. 3);this guide member 30 also carries the comb member 29, the locking device31, the lock springs 32a. and 32h, and the return screw 37.

The above-described inserting head is driven by means of a hydrauliccontrol distributor (Fig. 3) forming part of the control devices ofthemachine of which the inserting heads constitute but one element. Thishydraulic distributor provides for the unlocking, duration, stopping andproper sequence of the various movements involved. Therefore, referencewill only be made hereafter to the manner in which these movements takeplace in connection withthe operation of a winding head of the kinddescribed hereinabove.

Between the ends of the central shafts 22 of the inserting heads of astator coil inserting machine there is positioned a dummy rotor 47r suchas illustrated in Fig. 6, each slot 41 of this dummy rotor receiving apush member 42 held therein by spring rings 43. This dummy rotor iscoaxial with the stator 44 in whose rslots 45 the coils 46 disposedbeforehand in the slots 41 of the dummy rotor are to be `insertedthrough kthe medium of the radial movement imparted thereto by the pushmembers 42, the slots 41 and 45 being arranged in coextensiverelationship for this purpose.

When uid pressure is applied to the piston 14 of the central shaft, thisshaft moves axially and carries along the camshaft 23 and the toothedsegmentf17 which slides in the rack 38 while remaining in meshingengagement therewith. When this movement is completed, the central shaftengages with its outer end the bearing face of the corresponding dummyrotor spindle and is therefore properly positioned insofar as the actionof the tubular members and the release of the locking device isconcerned, the positions of the camshaft 23, rack 38 and control piston39 of this rack having been adjusted beforehand.

The application of uid'pressure to the pistons 15 and 16 causes theguide member 30 to move in the same direction as the previously actuatedcentral shaft; As the guide member moves the locking device 31, whichholds the tubular members 25, 26, 27,' 28 inv interlocked relationshipwith one another, these tubular members travel in this direction as longas they are engaged by this deguide member 30 continues its forwardtravel the locking device is again actuated on clearing each of thesuccessive steps 34, 35, 36 to release the following tubular members 27,26 and 25. When/this last tubular member has been released, any furthermovement of the guide member will have no inuence on the tubular membersand these will remain in position. Y f

As the guide member 30 is further moved by the continuing fluid pressureon the pistons 15 and 16, the comb member 29, the action of which wascommenced at an intermediate point to be adjusted beforehand, com pletesits travel to the extent required for the stator to be wound. When thewhole transfer operation is completed the guide member 30 is stopped. c

Figures 7 to 9 illustrate the successive steps of the transfer of thecoils from the slots 41 of the dummy rotor to those 45 of the stator,and the formation of the coil head.

Then the fluid pressure will act on the rack-actuating piston 39 and therack 38 in meshing engagement with the toothed segment 17 will cause thecamshaft 23 integral or fast therewith to rotate through the requiredangle of circular sector. Thus, conditions are set up for returning'thewhole assembly to its initial position, the locking device frictionallyengaging the smooth face 40 of the camshaft.

The reverse movements occur subsequently in the same manner through theaction of fluid pressure on the opposite faces firstly of both pistons15, 16, then of piston 14 and finally of piston 39, under the conditionsof adjustment of the hydraulic control. During these movements thetubular members are all restored to their original positions by thereturn screw 37 engaging the inner ends of longitudinal slots formed inthe walls of these tubular members.

The above description` of lthe operative movements taking place duringthe actuation of the inserting head according to this invention showsthat each movement can be adjusted independently of the other in orderto secure any desired sequence thereof by means of an external controlmember. Similarly, the amplitude, velocity and synchronization of themovements occurring eitherv in a single head or in a pair ofjointly-,operating heads may be controlled from external means. Thus,the use of inserting heads according to this invention in the design andmounting of coilfinserting machines is characterized by a greatflexibility and makes it possible to provide the operating conditionswhich are most suitablel for `the kind and rate of productioncontemplated. A

What I claim is:

1. in a coil inserting machine for inserting Winding coils into statorsof electrical machinery, the stators having peripheral slots extendinglongitudinally and radially thereof to receive the coils, incombination, a prewound false rotor `having a ,spindle and slots equalin number and substantially corresponding in Width to the stator slots,the pre-wound rotor` having` coils insaid slots, wedges associated withsaid coils for displacing the coils radially and arranged extending outof said slots at least at one end thereof, means for holding theA pre-Wound rotor co-axial with the stator and with the stator slotsdisposedradially of the rotor slots in correspondence therewith,V atleast one coil inserting head arranged adjacent one end of the statorfor driving the wedges radially thereby to drive the coils arranged inthe rotor slots radially into the stator slots, said head comprising afirst shaft movable longitudinally from a first position into co-axialengagement with the end ofthe rotor spindle adjacent to which the wedgesextend out of the rotor slots, a plurality of tubular membersl slidablyvice. When the locking device clears the first step 33 .l

of the camshaft, the resilient action of the pair of springs 32a and 32hwill cause it to release the rst or innermost tubular member 28 havingcompleted its travel. As the nested in one another and co-axial Withsaid rst, shaft thereby coaxial with said rotor, the tubular membersbeing frusto-conical at theirends next to the rotorv and adapted todrive said wedges and associated coils radially, a cam shaft radiallyspaced from said rst shaft and fixed thereto so as to be movable axiallytherewith and having a plurality of steps defining cam surfaces thereon,means for selectively driving the first shaft from the first positioninto coaxial engagement with said rotor spindle end, actuating meansguided on said rst shaft and movable axially thereon selectively to movesaid tubular members axially toward said false rotor, said actuatingmeans including means selectively engaging said tubular members, saidengaging means initially engaging all of said tubular members to movethem conjointly and being movable radially of said rst shaft and biasedinto engagement with said cam shaft to disengage said engaging meanssuccessively from said tubular members under control of said cam shaft,as said actuating means is moved toward said false rotor, beginning withthe tubular member of smallest diameter.

2. In a coil inserting machine for inserting winding coils into statorsof electrical machinery, the statorshaving peripheral slots extendinglongitudinally and radially thereof to receive the coils, incombination, a pre- Wound false rotor having a spindle `and slots equalin number and substantially corresponding in lwidth to the stator slots,the pre-wound rotor having coils in said slots with heads projectingoutside thereof, wedges associated with said coils for displacing thecoils radially and arranged extending out of said slots at opposite endsthereof, means for holding the pre-wound rotor coaxial with the statorand with the stator slots disposed radially of the rotor slots incorrespondence therewith, two fluid operated coil inserting headsarranged adjacent opposite ends of the stator for driving the wedgesradially thereby to drive the coils arranged in the rotor slots radiallyinto the stator slots, each of said heads comprising a rst shaft movablelongitudinally from a first position into co-axial engagement with theend of the rotor spindle adjacent to which the wedges extend out of therotor slots, a plurality of tubular members slidably nested in oneanother and co-axial with said first shaft thereby coaxial with saidrotor, the tubular members of graduated length with the innermost memberlongest and being frusta-conical at their ends next to the rotor andadapted to drive said Wedgesand associated coils radially, a cam shaftradially spaced from said rst shaft and fixed thereto so as to bemovable axially therewith and having a plurality of steps dening camsurfaces thereon, rst uid actuated means for selectively driving thefirst shaft into co-axial engagement with said rotor spindle end, secondiiuid actuated means guided on said first shaft and movable axiallythereon selectively to move said tubular members axially toward saidfalse rotor, said uid actuated means including means selectivelyengaging said tubular members, said engaging means initially engagingall of said tubular members to move them conjointly and being movableradially'of said rst'shaft and biased into engagement with said camshaft to disengage said engaging means successively from said tubularmembers under control of said cam shaft, as said actuating means ismoved toward said false rotor, beginning with the tubular member ofsmallest diameter, and means to deliver fluid under pressure foractuating said firstv and second tiuid actuated means in a selectedsequence.

3. A coil inserting machine according to claim 2, in which said camshaft is rotatable and is provided with a substantially at surfacespaced angularly from said cam surfaces, and including thirduid-operated means for selectively rotating said cam shaft into a rstangular position wherein said engaging means cooperates with said camsurfaces in successively disengaging the tubular members and forsubsequently rotating it to a second operative position wherein saidengaging means bears against said substantially at surface thereby topermit said rst shaft to be returned to its rst position, and vsaid rstuid actuated means being adapted to selectively return the first shaftto said first position.

4. A coil inserting machine according to claim 2, in which said tubularmembers are removable and replaceable with a different number of membersand replaceable vby members having a greater wall thickness, and inwhich means associated with the outermost tubular member in each head isconstructed to engage the heads of the coils engaged in the statorand tobend them to a predetermined nal configuration.

References Cited in the le of this patent UNITED STATES PATENTS2,506,173 Polard May 2, 1950

